(medicine) Itchy, swollen, red areas of the skin which can appear quickly in response to an allergen or other conditions.

Requiring immediate attention. / Of people: insistent, solicitous.

(chemistry, military) Uranium enriched with a higher than normal amount of the fissile isotope U-235; used in nuclear reactors and nuclear weapons.

(anatomy) The tube through which urine exits the body and, in penises, through which semen is ejaculated.

(Britain, obsolescent) A child who lives, or spends most of his or her time, in the streets; sometimes a petty thief or pickpocket.

(uncommon) A male given name from Latin / A surname originating as a patronymic. / An early Christian, also Urbane and Urbanus in various versions of the Bible. (biblical character)

Pertaining to, contained in, or obtained from urine.

(organic chemistry, uncountable) A water-soluble organic compound, CO(NH₂)₂, formed by the metabolism of proteins and excreted in the urine.

(anatomy) An elastic, muscular sac situated in the pelvic cavity, into which urine from the kidneys is temporarily stored prior to disposal by urination. Urine enters the bladder via the ureters and exits via the urethra.

A grouping of the Uralic language family with the Altaic languages, formerly considered a language family, now treated as an area of linguistic convergence, or possibly a sprachbund (like Altaic itself).